Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 181
e fulcrum a ; and this part of the beam is shod with an iron plate, full of small centre-holes for the brace. The weight is raised by the second lever c d, the two being united by a chain, anda light chain or rope is also suspended from d, to be within reach of the one or two men engaged inmoving… … The inconveniences in this machine are, that the upper point of the brace moves in an arc instead ofa right line; the limited path when strong pressures are \ised, which makes it necessary to shift thefulcrum a; and also the necessity for readjusting the work under the drill for each different…
Mechanical engineering
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten15unit-333-197.webp)